All releases of J80

Release Notes: A bug in the idle detection loop for CP/M was fixed. Support for the Z80Pack machine from Udo Munk was added. Support for a bootload parameter was added. When present in the configuration, the system searches for the boot loader in the first sector of drive A. Support for variable display size was added. The CRT configuration is now crt=classname[,col][,row][,font].